Azo dyestuff.



UNITED STATEQSA OSCAR GI J 'NTHER AND LEOPOLID HESSE,

PATENT OFFICE.

OF ELIBERFELD. AND ARTHUR ZART, OF

VOHWINKEL, GERMANY, ASSIGNORS TO FARBENFABRIKEN VORM. FRIEDR. BAYER &00., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

AZO DYESTUFF.

No Drawing.

Specification of Letters latent.

Application filed September 20, 1910. Serial No. 582,821.

Patented Apr. 11, 1911.

To all whom 'it may concern:

Be itknown that we. ()so-xn (ii'vx'riuan and Lnoronn Hnssn, residing atlllbei't'cld, nnd An'rnnn Zuni, residing at Vohwinkel, near Elberfeld,Germany, doctors of philosophy,

chemists, citizem ot' the German Empire,

.have invented new and useful Improvements in New Black Azo Dye. ofwhich the following is a Specification.

()nl' invention relates to the preparation of a new azo dyestufl' whichis obtained by combining the diuzo compound of QA-dini tranilin in acidsolution with 2-:unino-8- naphthol-G-su]tonic acid.

Thonew dyostufl' its nftei' being dried nnd to light and distinguished hllll'll' good resistance to the action oi boiling iniueiul acids.

. In order to illustrate the new prove; more fullywc can proceed awlollows the ptll'lh .ilin are dia'zotized with being by Wcight.:-1S3pnrtsof ZA-dinitx'iinnitrosylqdfurio acid as described in British LettemPatent No. 6197/1394. The dinzo eonipound is diluted with ice and addedat about 0' (l. to 2!. suspension oi Q39 part of the J-ninino-S-nuphthol-(t-snlfonic acid in water. The combination is complete after :1short time and the dye is then filtered oil" and dried.

pound oi Q.-'l-dinitrnnilin in acid solution 1 uponl'nniiuo-S-nnphthol-(MulTonic acid i which is after li ing: dried andpulverized in i the shape. of i't. sodium salt a (lurk powder oluhle inco urenti'uted sulfuric acid with a mlneral acid, substantially asdescribed.

yellowish-I'M color; yielding upon reducset o ur hands in the presenc oftwo subfi i'm with stannous .chlerid and hydrochloric i scribmgWitnesses.

*laid 1.2.4r triamin0benzene and 1.2-diamin0- OSCAR [L. s.]-naphthpLG-sulfonic acid; producing on LEOPOLD HESSE. [11. s.] woollevel b1uishb1ack shades fast to full- ARTHUR ZART. [L. 5.]

ing, to light and to the agtion Of boiling Witnesses:

CHAS. J. YVRIGHT, V In testimanywhereof 'we have hereunto ALFRED HENKEL.

